Mechanical movement



July 4, 1950 c. VAN ARMBRUSTER ET AL 2,513,383

MECHANICAL MOVEMENT Filed Feb. 7, 1947 1K1 HMM@ 29a 82 s /5 /qj I lilugiiml u I" WHIWIMMMMJM: I7/ 7/ 155 /4S 93 (zo Patented July l4, 1.950

,. Eric 'liylund Maine, Wie-2 assisnrs, im Jlfm OsterfMnutacturing Company, Racine, Wis.,

This invention 'relates'y tovim-provements. ini hair clippers of the ...power :driven type 'generally-re- `ferred to fas-electric --clippers and-Y-Whereinithe movable lcutter bladefis-reeiprocated byl an=elec tric motor built into the body-of the clip.per.

In clippersof `this .-t-ype the# drive transmission connecting the 'motor 'with the reciprocable vcut ter blade is an importantfconsideration. Hence, it is-an object of this iinventicnitosimplify Jthe drive transmission and-providef-one-which will assure smooth and Lquiet translation @ofi-drive shaft rotation into reciprocation ofr the cutter-blade..

VIt is particularly an object of this invention .to prov-ide ,la drive transmission for fthe -fpurposevdescribed, which -isinexpensivenandfeasy to produce. i N

Another obj ect `of this l invention is to). reduce the Weight of drive 'transmissionsY offthistype lto thereby enablea-reduction in the Atotal-Weight.of

'the clipper.v e l u With .theabove andfnther objects in view which will 'appear `as the-description proceeds,` this .in-

vention resides inthe `novel combination and arrangement df parts substantially.asrhereiriaiter described 'and "more vparticularly defined -v by the appended claims, itfbeing understood' that such changes in the .preciseembodiment-of .the hereindisclosed invention may befmade as come -Within the scope of the claims.

The accompanying fdravving illustrates one complete example of the physical embodiment of the invention constructedinfaccordance with the best mode so far devised for-the practical application' of the principles'thereoivfand inwhich:

Figure l is a top plan view'of'the fvfdrepart of an electric hair clipper 'embodying this invention, said view having `-the v cover of the drive transmission housing removed;

Figure'Z is a side elevational view of the forepart of the clipper With parts broken away and in section; and

Figure 3 is a perspective view of the forepart of the clipper with the cutter head and cover for the transmission housing removed.

Referring now particularly to the accompanying drawing the numeral 5 designates the body of an electric clipper which, as is customary, is molded from a suitable plastic and houses an electric motor (not shown). The forepart 6 of the clipper housing is formed to provide a transmission housing or cavity 'I into which the motor armature shaft 8 projects. The extreme front end of the clipper body is inclined and has a cutter head 9 secured thereto by means of screws I0.

The cutter head is of conventional design and comprises @stationary mace 45|, :through which the screws I0 pass, andfa movable blade -I2held assembled.y vvithfj` the stationary bla-de under 'the gpropervdegree-of tension by-a `spring -I-3. The vspringfI-so yengages-themovable blade I2 as to l guide .the samefior Areciprocation across-the face t off-the stationary blade.

K ymuleccentricIll is-=journa1ed lon a stub shaft I5 lined .in ztlfie .bottom rWall of the transmission .housing or cavity .'I,..and`is drivenyfrom the. arma- '-fhelmotion. of the eccentric is The [actuator unit iconsists of -a vlength of l spring .steel -ribbon ystock 'bent to .substantially U-sll'iapelsofastcfhave 4tvvo side-armsfIS and 20 connected byaqcrosspiece ,2 I. When this actua- -trdunitwisfree Vto'assurne its normal shape, the

side arms vare parallel (and at right -angles-tofthe crosspiece. The freerends of the .side arms are .v anchored tothe rear A-W-all 22 of the vtransmission 25'v housingy or` cavity .1 by Y screvvs`23 or yother-suitable fastening means.

.,Inasmuchfwas the Wallffiz isinormal-to theaxis `\fqtheshaft8;andrparallel,with the direction of .reciprocationzof themovable cutter bladeit fo1 -loWsthat .the points of anchorage ofthe spring arms IGfaI-rwZDfare likewise?parallelwith the dilrecticnglifreciprocation-of ythe movable cutter "blade,I .The points yfof 1'anclfiorag-e -are -also so ,spaced as torinaintain initial parallelism' between ,35y

the: side Varmstand dh. The sidearms- I9 and 2Q with their connecting f crosspiece -2I @and the Wall 21? Ithus den-ne 'a' parallelogram, vwhich ris adapted toebe r`rocked Afrom -fside to 'Iside -by the eccentric` To enable the eccentric to'impartrmovement to the actuator unit a third spring arm 24 extends forwardly from the anchored end of the side arm 20 and is secured to the crosspiece as at 25 with the arms 20 and 24 parallel and spaced apart a distance sufficient to snugly receive the eccentric therebetween.

The crosspiece 2| is drivingly connected with the movable cutter blade I2 by a lug or tongue 26 projecting from a rigid crossbar 2-1 secured to the crosspiece by rivets 28. The lug or tongue 26 protrudes from the transmission housing 'I to engage in a notch or recess in the cutter lblade I 2 in a manner permitting ready removal of the cutter head.

To strengthen the actuator unit and damp out any internal vibrations that might be set up inl its spring arms and crosspicce, anges 29 are formed on al1 of the spring arms and the crosspiece. These anges stiffen the arms and the crosspiece, but, terminating short of the corners,

do not preclude proper flexure as required for the y back and forth motion of the parallelograml-like actuator unit.

The open top of the transmission housing (is closed by a suitable cover 30 held in place byf screws 3|, and any suitable meansv not shown- Y A may be employed to seal the front ofthe Vlirans-f mission housing `against the egress of the grease*Y l. or other lubricant with which the tra'nsmission1N housing is packed.

From the foregoing description, taken in con-'-H "v i nection with the accompanying drawing, it will be readily apparent that this invention provides, t

tions' on'said spring'arms providing for fxedl'yf anchoring the ends of the arms remote from the bar to a support, wherebythe spring arms may be flexed laterally backV and forth in unison `to carry said crossbar vwith an endwise reciprocating motion; an eccentric adapted to be rotatably connected with the power source; means on .the actuator unit embracing the eccentric so that rotation thereof eiects back and forth lateralflexure of said spring arms andy endwise reciprocating movement of the crossbar; and a driving` lug' on the crossbar. v

2. Transmission means of thev character dey scribed, comprising: a pair of opposite substantially parallel spring arms of equal length; a

1 third arm joined to said spring arms crosswise of the arms and at one end thereof, Vsaid third arm. being adapted to be carried bythe spring arms with an endwise motion upon lateral flexure of the spring arms in consequence to the application of force to any one of said arms in the direction of the length of said third arm; attaching portions on said spring arms for fixedly anchoring the ends thereof remote from the third varm to l a support while leaving the remainder of the n spring arms free for lateral fiexure; a rotatable j eccentric connected with one of the arms for flexing the spring arms laterally back and forth in unison to thereby impart endwise reciprocating movement to said third arm; anda driving lug on said third arm.

3. Transmission means for translating rotation from a power source into a reciprocating movement, comprising: a drive arm having a driving lug thereon; means for guiding said drive arm for endwise reciprocatory movement comprising a pair of substantially parallel spaced 'ap'artarms 'of' equal length joined at one end to`said' drive arm and projecting from one side thereof, and attaching portions on said parallel Yarms for attaching the ends thereof remote from -the drive arm to a support while allowing the drive arm to move endwise back and forth relative tothe suppOIt `under the guidance of said vparallelfarms; an eccentric adapted to be ro- I tated from the lpower source; and a motion trans- 'mitting"connectio`n between said eccentric and Yone. offsaidarms'. Y

j* 1.Transmission means of the character described comprising: a rotatable eccentric; an actuator unit comprising a length of spring stock bentgto substantially U shape so as to provide v'spaced parallel side arms connected by a crosspiece! attaching meanson the actuator unit for liixedly anchoring theends of said side arms-remote-from the crosspiece to a support; and

means von the actuator unit embracing the eccentric so thatv rotation thereof imparts simultaneousback and forth flexing motion to said iside arms -and substantially endwise reciprocatory motion to 'said' crosspie'ce.

y-'5;` Transmission means of the character described comprising: a rotatable eccentric; an actuator unit comprising a length of spring metal bent to substantially U shape so as to provide spaced parallel side arms connected by a crosspiece; a driving lug on the crosspiece; attach- "ingfr'neans onfsaid actuator unit for fixedly anchoring the ends of the side arms remote froml vthecrosspie'ce to a support while leaving the remaining portions ofthe side arms free for back and' forth lateral flexure in unison; and

another spring armcarried bythe actuator unit 1n spacedv relationship toone of the side arms Vthereof andy cooperating with said designated side l :arm to embrace the eccentric so that rotation of f the eccentric imparts back and forth lateral exure tothe side arms and substantially endwise reciprocatoryr movement to the crosspiece.

CECIL VAN ARMBRUSTER. I ERIC BYLUND.

REFERENCES CITED The following references are` of record in the iile of this patent:

`UNrrED STATES PATENTS v -Number Name Y Date 1,853,587 Dremel' s May 17, 1932 

